Haug, Tobias and Klemm, Philippe and Bange, Sebastian and Lupton, John M. (2015) Hot-Electron Intraband Luminescence from Single Hot Spots in Noble-Metal Nanoparticle Films. PHYSICAL REVIEW LETTERS, 115 (6): 067403. ISSN 0031-9007, 1079-7114
Full text not available from this repository. (Request a copy)Abstract
Disordered noble-metal nanoparticle films exhibit highly localized and stable nonlinear light emission from subdiffraction regions upon illumination by near-infrared femtosecond pulses. Such hot spot emission spans a continuum in the visible and near-infrared spectral range. Strong plasmonic enhancement of light-matter interaction and the resulting complexity of experimental observations have prevented the development of a universal understanding of the origin of light emission. Here, we study the dependence of emission spectra on excitation irradiance and provide the most direct evidence yet that the continuum emission observed from both silver and gold nanoparticle aggregate surfaces is caused by recombination of hot electrons within the conduction band. The electron gas in the emitting particles, which is effectively decoupled from the lattice temperature for the duration of emission, reaches temperatures of several thousand Kelvin and acts as a subdiffraction incandescent light source on subpicosecond time scales.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | LIGHT-EMISSION; AU; PHOTOLUMINESCENCE; NANOSTRUCTURES; GENERATION; EXCITATION; SCATTERING; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group John Lupton |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Jun 2019 12:31 |
| Last Modified: | 14 Jun 2019 12:31 |
| URI: | https://pred.uni-regensburg.de/id/eprint/5038 |
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